Iphone 4S no power on, short somewhere – iphone problem , and strang issue solution
Bit of background: a few months ago I used a bad charger and the power protection circuit broke, so I could only charge the phone when off, and couldnt sync it. Getting a new phone so thought I attempt a repair and would sync it one last time so I could get all my data off etc.
Tried to jumper L3 & L4, but something has gone wrong and now I cant power on. The power management unit (I think) gets very hot when battery is plugged in. Not so bad Along with USB but still cant turn on.
Do I want to replace the chip? Cant find anywhere that has the exact same symptoms. Thanks!
Bit of background: a few months ago I used a bad charger and the power protection circuit broke, so I could only charge the phone when off, and couldnt sync it. Getting a new phone so thought I attempt a repair and would sync it one last time so I could get all my data off etc.
Tried to jumper L3 & L4, but something has gone wrong and now I cant see the LCD. The power management unit (I think) gets very hot under some situations.
I thought it wasnt powering on but by using the vibrating switch I realised it is on, I just cant see anything. All I want is to sync it one last time, not too worried about getting the screen back. Thanks!
Have you got a microscope? have a look at the lcd connector, see if any of the filters are missing, also check the capacitors for a short, and check L18/L19, D4.
L18/L19 seem fine, cant see contacts on D1 to check?